The development of data communication services like voice (VoIP) and video streaming, causing traffic load on networks which has limited buffer space and bandwidth. This condition makes VoIP and video streaming users need a network which can provide Quality of Service (QoS) to fill user needs. The IETF (Internet Engineering Task Force) has a standard service mechanism to fill QoS requests such as Incorporation of MPLS Diffserv technology which able to classify the package as needed but when the buildup occurs due to this QoS process, the packet will be dropped, Then the solution to anticipate dropping is used threshold algorithm on WRED. Added WRED as threshold algorithm on the MPLS-Diffserv network give a significant effect, from the results of QoS parameters for VoIP service is able to reduce packet loss 43.1%, delay 0.005%, maximize of throughput 1.26% and reduce jitter 48.56%, for streaming video services reduce packet loss 15.93% and maximize the troughput 1,6% than before applying the threshold algorithm.